Inter-University Centre for Astronomy and Astrophysics (IUCAA) | 2017 Jul 13
Indian astrophysicists identify mega-structure of galaxies 4 billion light-years away - several scholars and faculty of Indian Universities involvedA team of astronomers from the Inter University Centre for Astronomy & Astrophysics (IUCAA), and Indian Institute of Science Education and Research (IISER), both in Pune, India, and members of two other Indian universities, have identified a previously unknown, extremely large supercluster of galaxies located in the direction of constellation Pisces. This is one of the largest known structures in the nearby Universe, and is at a distance of 4,000 million (400 crore) light-years away from us. ...
- The distribution of galaxies, from Sloan Digital Sky Survey (SDSS), in Saraswati supercluster. It is clearly visible that the density of galaxies is very high in the Saraswati supercluster region. The typical size of a galaxy here is around 250,000 light years. The galaxy sizes are increased for representation.
Large-scale structures in the Universe are found to be hierarchically assembled, with galaxies, together with associated gas, and dark matter, being clumped in clusters, which are organized with other clusters, smaller groups, filaments, sheets and large empty regions (“voids”) in a pattern called the “Cosmic web” which spans the observable Universe.
Superclusters are the largest coherent structures in the Cosmic Web. A Supercluster is a chain of galaxies and galaxy clusters, bound by gravity, often stretching to several hundred times the size of clusters of galaxies, consisting of tens of thousands of galaxies. This newly-discovered ‘Saraswati’ supercluster, for instance, extends over a scale of 600 million light-years and may contain the mass equivalent of over 20 million billion suns. ...
Saraswati: An Extremely Massive ~ 200 Megaparsec Scale Supercluster - Joydeep Bagchi et al
- arXiv.org > astro-ph > arXiv:1707.03082 > 10 Jul 2017